[Xen-devel] [Patch] domain create optimization

To:	"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	[Xen-devel] [Patch] domain create optimization
From:	Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
Date:	Thu, 22 Apr 2010 14:11:59 +0200
Delivery-date:	Thu, 22 Apr 2010 05:13:07 -0700
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Hi,

attached patch optimizes the creation of a domain in cpupool Pool-0 by not
moving it from Pool-0 to Pool-0 :-)


Juergen

-- 
Juergen Gross                 Principal Developer Operating Systems
TSP ES&S SWE OS6                       Telephone: +49 (0) 89 3222 2967
Fujitsu Technology Solutions              e-mail: juergen.gross@xxxxxxxxxxxxxx
Domagkstr. 28                           Internet: ts.fujitsu.com
D-80807 Muenchen                 Company details: ts.fujitsu.com/imprint.html

Signed-off by: juergen.gross@xxxxxxxxxxxxxx

diff -r b0562b298d73 xen/common/cpupool.c
--- a/xen/common/cpupool.c      Wed Apr 21 12:51:53 2010 +0100
+++ b/xen/common/cpupool.c      Thu Apr 22 13:54:11 2010 +0200
@@ -520,6 +520,12 @@ addcpu_out:
             rcu_unlock_domain(d);
             break;
         }
+        if ( op->cpupool_id == d->cpupool->cpupool_id )
+        {
+            ret = 0;
+            rcu_unlock_domain(d);
+            break;
+        }
         printk(XENLOG_DEBUG "cpupool move_domain(dom=%d)->pool=%d\n",
             d->domain_id, op->cpupool_id);
         ret = -ENOENT;

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[Xen-devel] [Patch] domain create optimization